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 Yes, I know the pear stack is foss. It's just that there is no way to verify what Keet is doing with messages and metadata. Need to assume anything you send there is public. 
 I meant that's not a bad policy. I know the guys and so just trust them personally, but if you have no basis of them, their history, and what seems likely to you, then yeah that's a very prudent stance to have.

Same goes for all the software we use. In a very similar sense neither MacOS or Windows is open source. For Mac the kernel is open source because its based on Linux, but things like the user interface and graphics engine are closed source. 
 I think I'm going to start breaking ties with MacOS 
 Agree!

There are many great alternatives to Keet features, however. Not the case for desktop operating systems. I use MacOS (kinda forced to) and Linux, and Graphene on mobile.